7. Find the area of the shaded regions.
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a) Area of the shaded region = Area of the rectangle - Area of the triangle
Area of rectangle = l × b = 10 × 16 = 160 cm²
Area of the triangle = 1/2 × base × height = 1/2 × 8 × 17 = 68 cm²
Area of the shaded region = 160 cm² - 68 cm² = 92 cm²
b) Area of the shaded region = Area of the square - Area of the circle
Area of the square = side × side = 14 × 14 = 196 cm²
Area of circle = πr² = = 154 cm²
{Side of the square = Diameter of the circle}
Area of shaded region = 196 cm² - 154 cm² = 42 cm²
c) Area of the shaded region = Area of the rectangle - Area of the triangle Area of the rectangle = l ×b = 40 × 80 = 3200 cm²
Area of the triangle = =
= 1600 cm²
Area of the shaded region = 3200 - 1600 = 1600 cm²
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